Toothbrush



FIG. 1 is a front view of our new design for a toothbrush;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a front view of an alternate embodiment of our design for a toothbrush;

FIG. 5 is a right side elevational view thereof, the left side being a mirror image thereof; and,

FIG. 6 is a rear view thereof.

The portions of the top and bottom surfaces neither shown in the drawing nor described in the specification, form no part of the claimed design. 

The ornamental design for a toothbrush, as shown and described. 